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Rear Wheel Arch Rolled Edges

Andy B Aces High

Andy B Aces High

New member
Unfortunately since lowering my car and having the suspension set up my tyres on big dips in the road are rubbing on the wheel arch beads, anyone know of someone in Kent who has the tool and experience to roll the beads as per the RS body cars ?

Andy B.
 
Hi Andy, not sure about Kent, but I think you're familiar with Tognola, I thought they had the equipment? Failing that, I reckon Specialised Paint in Reading should be able to do it.
Be careful though, it can look odd if they flatten them completely.
Incedently, what wheels and tyres are you running?
Regards
GR
 
Hi GR,
The wheels were on the car when I bought it, they are 18" Turbo Twists with 265 35 R18 Conti Contact 2 tyres which I have just fitted, before they were Yokahama AVS which have a more rounded edge profile so they didn't touch but they wore out too quick.

I think the main problem is that the wheels have the wrong offset. Think they have offset to suit Turbo/S models. Any idea the actual measurements for wheel offsets (ie front face to hub face and rear face to hub)?

Andy B.
 
If they are OEM wheels they will have the offset stamped around the valve area. Wide body cars on 10" wide 18" rims will have and offset of 40 and narrow body cars have a greater offset of 65.

Ian.
 
I'm running turbo twists with 265 rears on a seriously lowered 993 narrow body. No rubbing! Wonder if you've not got the 65mm ET rears.
I wouldn't like to roll the arches though - what happens when the rolled arch meets the plastic bumper?
ET 40 means 25mm less clearance on the outer wheel arch which I don't think there is anywhere near enough room for. (pardon bad grammer)
Wonder if you could dial in a little neg camber.
 
Hi Andy,

I have a similar problem with some wheels that I bought. They are RS replicas but the ET is for a widebody car. I think the 993's Turbos came with a 47 offset. The standard rim is 55 so the turbo twists for they narrow body are 65 ET, pulling them some 10 mil inwards whilst the 47's go some 8 mil the other way. Coupled with wider tyres it doesn't work. As Ubertub suggests, you may get away with it by dialing in more negative camber bringing in the upper part of the wheel. Doesn't do your straightline traction any good, or your tyre wear, but it may get the wheels to fit. Firstt thing to do though is to check the ET on what you have. As Ian says, the ET will be stamped on the wheel next to the valve stem if they are OEM wheels. If not, it may be on the inside on the spokes.

Regards
GR

 
ORIGINAL: Guards Red

... I think the 993's Turbos came with a 47 offset ...
Click to expand...

Pretty sure they were ET40 same as 2S and 4S cars. It's covered in the FAQ section from memory.

Ian.
 
Andy,
I run 8*18 on front with 235*40*18 with 50 offset and 10*18 on rear with 65 offset and 265*35*18 Toyo R888's, for the track. Car is narrow bodied and lowered and although it looks close I have never had tyres touch body. I think your offsets may be for the wide body cars.
Chris
 
Hi Guys,

Had a look at the wheels, the ET number is not on the outside but used a torch and mirror and found ET47 on the back of one of the spokes. It is as I suspected and you guys have clarified the wheels have offset to suit the Turbo.

Not sure how to go forward now, I really do not want to roll the arches as this mod is too permanent. Will have to take a look at some new rear rims I suppose but will need to find some that match the fronts. More damded expensive that I had not accounted for !! So is it ET65's that I need then ?

Andy B.
 
Hi Andy,

Ideally yes. The RS wears 65ET rears, they're the right size to have if your car is lowered to anywhere near RS ride heights. There are loads of Porsche rims at that width, assuming yours are standard turbo look wheels, you can get rears to match what you have. One way is to check with a breaker, it's easier for them to sell sets then one offs, you may get two cheap if they have them from a totalled car. Make sure you check them for run out, you'll not advance your cause buying bent ones!

Good luck.

Regards
GR
 
It might be worth you taking a front or rear rim off the car to see if you can see the make of wheel stamped on the inside as you might be able to find a matching pair in the correct offset. The rims are not Porsche OEM rims as they don't have the stamping by the valve.

ET65 is what you want for a narrow body. Here is the link to the FAQ on 18" wheels http://www.porscheclubgbforum.com/tm.asp?m=112688

Ian.
 
I have ET65 wheels on the back and I even manage to squeeze 285/30/18 Pirelli's under there. Mine is a narrow bodied car BTW!
 
Thanks guys.

GR, does the RS have the wider rear arches ala Turbo/S models ?

Sidned, What make of tyre you runing ?

Had a quote from Design 911, they have ET55 and ET65's in stock at £400 for the pair. Still debating which route to go down.

Andy B

 
Andy,

If the rims are not original Porsche turbo twists would it be possible to get the mounting flanges machined to the correct offset? I wouldn't recommend that course of action for proper Porsche rims but after market copies are less likely to command a premium in the second hand market (IMHO).

Just a thought...
 
Hi Andy,

the RS is a narrow body. I'd pick the 65ET if I were you, you can run the same rubber as the RS that way which would be 265/35/18s. I assume what you have now are 18s? In which case you just need to swap the rubber over.

Regards
GR
 
Hi Alex,

This was going to be a possible way forward, I have a milling machine in my workshop and have been taking a look at it to see if I can machine them on this. Would need to use a DTI to ensure they are true and then machine away some of the material. Would probably need to have them balanced again afterwards to ensure they are still okay.

Need to check that the brake calipers will not rub the back of the wheel before taking this route, I do not want to solve one problem and create another !! Also will need to check the wheel nuts as the studs will be protruding further. Would probably look at taking off 8mm which would bring them to ET55 spec.

Andy B.
 
ORIGINAL: Andy B Aces High

Need to check that the brake calipers will not rub the back of the wheel before taking this route, I do not want to solve one problem and create another !! Also will need to check the wheel nuts as the studs will be protruding further. Would probably look at taking off 8mm which would bring them to ET55 spec.
Click to expand...

Ah yes, I hadn't thought of the issue with the stud length (and had assumed that brake caliper clearance will be OK) easy enough to fix but might make it more hassle than getting new rims.
I guess thinking about it now, the amount of material left between the nut seat and the mounting face is a fairly fundamental dimension and if this goes too thin it míght mean trouble.

Perhaps it wasn't such a great idea after all [&:]
 
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